Internal-combustion engine



I. DAVIDSON. y INTERNAL COMBUSTION ENGIN. APPLICATION FILED Nov.'22, I9I9.

1,414,072. Patented Apr. V25, 1922.

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5 v 6 4 7 /I 7 I m v if f 5 hij ff .QM p y JOHN DAvInsoN, or MANCHESTER, ENGLAND.

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To aZZ whom t may Concern l."

Beit `known that L'JQHN DAVIDSON, a subject of the King of Great Britain, re' siding at Manchester, in the-county of Lancaster, England, have invented certain use# fullmprovementsl in and Connected withv Internal-Combustion Engines, ofpwhich the following is aspeciica'tion.

' This invention relates to that type of 'single Y acting internal combustionengines l which comprisea charging cylinder at the rear of the working cylinder andl a reciprocating sleeve around the'working piston' having a charging piston working 4in the charging cylinder and means for closing the end of said sleeve. Y,

ln this type ofengine it has previously been proposed to provide-a mixture chamber which separated the charging cylinder from the working cylinder,v and communicated through valve controlled ports with the charging cylinder, ports being provided in the reciprocating Asleeve adapted to open' the mixture chamber to the working chamber, whereby the mixture wasrst admittedl through the valve controlled ports to the mixture chamber before it was admitted toV the working cylinder by the ports in said sleeve.

' and silent in operation. and specially applicable for small power. Y

According to my invention, in a single acting internal combustion engine of the specified type, the charging chamber of the charging cylinder opensdirect into the combustion chamber of the engine and the sleeve divides the charging chamber from the combustion chamber, ports being formed in said Sleeve adapted to open said charging cylinder chamber direct to said combustion chamber when the charge hasl been compressed by the charging piston on said sleeve. Y

I attain said objects by thermeans illustrated in the accompanying drawing which shows a vertical section of a two cycle single acting internal combustion engine constructed in accordance withmy invention.

Referring to the drawing, a is working cylinder, Z) the chargin working piston, cZ the c arging piston, e the-crank shaft and f the crank shaft casing.v

The working piston c is of the well known Construction and of suitable length tov keep cylinder, c theA INTEBN'AL-coivrnusrrolv ENGINE.

i Specification ot' Iietter; atent. i 25, v Application med Novemterrzaieiaf sferiainaasaaspo. i (GRANTED ammi-mira rnovrsIoNs or 'rrrE or lor. MARCH 3, 1921,.'541 sur.v r.,131a.' I

` :the exhaust ports g inthe working cylinder a covered during the inward-stroke'and'tol 'uncover same at the end of the outward stroke. f i y 1 Y Around the working-piston c is fitted theVv sleeve' 7L' arranged "tol slide in the working cylinder av which sleeve is'jpreferably reciprocated directly from the; crank shaft @,Vor

some distance intol the charging cylinder b. o 1s the combustion chamber of the enginey closed'rat one'end by the cover projection m. and at the otherend by the head of the working piston c. Y v L It Vwill thus be4 seen that said combuseol 4170 rFhe said sleeve 2extends beyond the workyingfcylinder'and ts around the projection Lmfof' the'cylindercover nwhich extends .whichvis surrounded by the sleeve h' and lso tion chamber can be made vof very efficientk form. j l Y.

The cover pro] ection m around which'said packing rings ,p1

The chargi ture to the chamber g ofthe charging cyl- Y inder Z) when `the inner endoftthe piston Z over runs same, and from the `charging chamber g to thewo'rking cylinder a through pistonl is formedv'on the inner end of the sleeve 7b and reciprocates sleeveV reciprocates, is fitted with suitable ports Z formed insleeve ZL when said '.-ports Z over run projection lml formed on cyllnder cover. y Y l With a'view of reducing theflength and weight of the engine and reducing the' inertia effect to a minimum, the travel of said sleeve and with it'the charging piston may be made considerably less than that of the working piston. y y Y v The engine described operates as follows: During the instroke of the sleeve :h and' charging piston d, a partial vacuum is formed. in the charging Cylinder Chamber c and when the edge of the piston CZ over runs the inlet ports r a supply 'of mixture is drawn in.

Upon the out stroke taking place, the miX- ture is compressed in the charging cylinder chamber Q by its piston d until near the end of the stroke, the inlet ports Z in the sleeve 7L over run the edge of the cylinder cover projection mand allow the mixture to pass into the Working cylinder a.

Just before this takes place, I the Working piston 0 has uncovered the exhaust ports g and allowed the burnt gases to escape ready for the incoming charge. The sleeve 1h then moves inwards, cutting off the ports g and almost at the same time the Working piston c moves inwards in the sleeve 7L and compresses the charge Which is then fired in the Well known manner'.

It will be readily seen that the inlet to the charging cylinder chamber g may be controlled by the charging pistonV (l at the end of its stroke over lrunning the ports 1 -in the charging cylinder "or chamber.

I claim In a single acting internal combustion engine of the khereinbefore specified type, in

combination, a combustion chamber; a

charging cylinder opening at its inner end direct into the combustion chamber; a Working piston; a reciprocatory sleeve around said working'piston separating the interior of the charging cylinder from the interior vfront of the charging piston in open communicatlonat all times With the charging cylinder and adapted toplace the interior of the charging cylinder into direct com-V munication With the interior of the' combustion cylinder when the charging piston reaches theend of its inwardstroke.

Signed at Manchester, in the county of Lancaster, this 7th day of November7 1919.

4 Y l v JHN DAVIDSON.

Witnesses: I I

lALFRED V`BossHARDT, MARY I. BoosHARD'r. 

